The term Texas City on the Mexican Border can be summarized by two crossword solutions: Socorro (7 letters) and Del Rio (6 letters). Socorro is a city in El Paso County, Texas, located on the Rio Grande river, which forms the border between Mexico and the United States. Del Rio is a city in Val Verde County, Texas, also located on the Rio Grande river. Both cities are situated on the Texas-Mexico border, making them important points of entry for both countries.